OMSA on R720's with iDrac7's running ESXi?

​So I have R720's with iDrac7's, with iDrac7 Enterprise Licenses, and running ESXi 5.1. Is there any real reason to install OMSA in ESXi? Can't the iDrac7 do everything without OMSA? What does OMSA in ESXi provide the IDrac7 does not?​

​ps. I'm also monitoring with OME.​

​Thanks.​